Accession Number : ADD007399

Title :   Energy Absorber.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Phillips,Norman S ; Walcott,William B

Report Date : 27 May 1980

Pagination or Media Count : 7

Abstract : A notched-energy absorber for attenuating high level accelerations such as would occur during aircraft crashes, thereby avoiding injury to a user. The energy absorber force-displacement curve has a large initial spike, followed by a valley or 'notch' and then by a constant force level intermediate the spike and valley levels. In one embodiment, a conventional square-response type shock absorber is connected between a vehicle seat and the vehicle body by a shearable diaphragm fixed to vehicle structure. The diaphragm shears at a notch when it experiences an initial high force, after which the conventional absorber moves freely without deforming until it encounters a stop. The conventional absorber then elongates or compresses in a conventional manner. In an alternative embodiment, a spring is connected between the seat and the vehicle body. Initially, the spring is compressed by experienced forces until at a predetermined force level it forces out a retaining clip or ring. The spring thereupon crushes a honeycomb, forming the valley or 'notch'. After the honeycomb is crushed, a conventional shock absorber attached thereto is compressed in a conventional manner. (Author)

Descriptors :   *Patents, *Energy absorbers, *Shock absorbers, *Aircraft seats, *Aviation safety, Inventions, Aviation accidents, Crashes, Springs

Subject Categories : Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE